Introduction - If you have any usage issues, please Google them yourself
1 no count and no authentication , the shell running level result in who run the server in server side
2 basic ftp transferring functions as get files (g files ) and send files(s fname).
3 running common shells in client side(!cmd) and server side(cmd)
4 support multi-connections for multi-clients
5 Ctrl+C to break client and server shells
6 error return: the server side will print error message in /var/log/wasd.log,
and the client side will print these to stderr